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A facile two-step method has been developed to synthesize 3D core/shell-structured composites (CNTs@Ni–Co–S) composed of ternary nickel cobalt sulfide nanosheets (Ni–Co–S) as the shell and carbon nanotubes (CNTs) as the core on a flexible Ni mesh (Ni@CNTs@Ni–Co–S).

In the quest for many sustainable energy conversion technologies such as water splitting and fuel cells, developing inexpensive yet highly efficient and robust electrocatalysts for the oxygen evolution reaction (OER) is urgent but still an enormous challenge. Herein, tip-welded bimetallic iron−cobalt sulfide nanotube arrays with tunable morphology and composition were fabricated via a templatefree method and directly grown on carbon cloth (FeCo 2 S 4 NTA/CC) as a flexible binder-free catalytic electrode. Based on the well-defined hollow nanotube structure, more abundant active sites are exposed, which accelerates the charge transfer process. In addition, the composition of the catalysts also plays an important role in the electrochemical behavior. Benefited from the unique structure and synergistic effect of bimetallic sulfides, the obtained FeCo 2 S 4 NTA/CC exhibits an outstanding electrocatalytic activity toward the OER with an extremely low overpotential of 317 mV to drive a current density of 100 mA cm −2 , a small Tafel slope of 36 mV dec −1 , and excellent durability during the alkaline water electrolysis in 1.0 M KOH.

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